Reversible hydrogen release and uptake for composites of LiBH4 with the conjugated polymer poly(p-phenylene)

In this study, hydrogen release and uptake properties for composites of LiBH 4 with the conjugated polymer poly( p -phenylene) (PPP) were investigated. The incorporation of LiBH 4 with PPP led to a significant destabilization effect, decreasing the dehydrogenation temperature of LiBH 4 by 100 °C. Moreover, LiBH 4 could be regenerated at 450 °C under 9.0 MPa H 2 . By thorough analyses using XRD , HRTEM , FTIR , Raman, XPS as well as 11 B MAS NMR, the dehydrogenation product of LiBH 4 +PPP and the regeneration mechanism of LiBH 4 are elucidated. Also the reason of capacity degradation is discussed based on the analysis results. The formation condition of LiBH 4 was significantly moderated due to the presence of a simultaneously formed amorphous mixture of boron and carbon, which sheds light on the improvement of LiBH 4 reversibility .